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Old 28th September 2003, 01:15 PM   #1
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Default How to use OPA549 and OPA541?

Hi everyone!

I was hoping anyone can help me in building a chipamp using the opa541 and opa549 chips from Burr-Brown.

I found a schematic from an application note, can I use this for the opa549/541 chips?

Regards,
JojoD
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Old 28th September 2003, 02:54 PM   #2
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Ok, I got the sheets for the 549. What are the suitable values for R1 and R2 (Gain) resistors?
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Old 28th September 2003, 08:05 PM   #3
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i used 10k and 100k

it depends on the gain you want and the input resistance you need. If you need more gain use 10k/200k, if you need more input resitance use 20k/200k and so on.
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Old 28th September 2003, 08:10 PM   #4
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Quote:
Originally posted by JojoD818
What are the suitable values for R1 and R2 (Gain) resistors?

my favorite has been 20k/1k combo, part because I have lots of them. In addition, higher values in theory will cause more noise and higher DC offset. But I never experienced that in my trials.
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Old 29th September 2003, 04:39 AM   #5
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Thanks guys!

Is the pcb design critical? I mean is grounding a big issue?

JojoD
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Old 29th September 2003, 05:20 AM   #6
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I forgot something to ask.... what do I do with the E/S pin? Should I just connect it to the V+?

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JojoD
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Old 29th September 2003, 09:07 AM   #7
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Quote:
Originally posted by JojoD818
I forgot something to ask.... what do I do with the E/S pin? Should I just connect it to the V+?

Regards,
JojoD

i just snapped off the pin. it does not need to be connected.
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Old 29th September 2003, 04:05 PM   #8
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It's working! Thanks to all who helped! Sound is very clear and worth the finger twitching caused by so small space.

JojoD
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Old 16th October 2003, 11:04 AM   #9
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Default OPA541

Hi guys,

I'm now about to try the OPA541, however, I am not sure how to connect this chip. Is there realy a resistor in series with the load?

Any diagram or pcb would be helpful. Thanks!
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Old 4th November 2003, 04:45 PM   #10
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Hi all!

I'm new to diy audio stuff, and want to make my first simple chip amps, but I don't know if the schemantic I have is OK for my needs (I think I already blew 2 ICs with the previous I used). I'm using OPA 541/549. I'll be happy if you could look at these 2 test PCBs. Both were made for the OPA 549T, the first test circuit will be powered by a PC ATX power supply since I don't have a dual supply yet, the second by a dual one when I'll get a dual 30V toroid (and have the time to make the regulator etc.) Source will be my sound cards sub out, on the out is a 8ohm sub.

Thanks a lot,

dArk
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